Buggy code:
public class StandardJMeterEngine implements Serializable , Runnable , JMeterEngine , JMeterThreadMonitor { private static final Logger log = LoggingManager . getLoggerForClass ( ) ; private transient Thread runningThread ; private static long WAIT_TO_DIE = 5 * 1000 ; private transient Map allThreads ; private boolean running = false ; private boolean serialized = false ; private volatile boolean schcdule_run = false ; private HashTree test ; private transient SearchByClass testListeners ; private String host = null ; private transient ListenerNotifier notifier ; private static final boolean startListenersLater = JMeterUtils . getPropDefault ( "jmeterengine.startlistenerslater" , true ) ; private static transient Map allThreadNames ; private static StandardJMeterEngine engine ; private static Map allThreadsSave ; public static void stopEngineNow ( ) { } public static void stopEngine ( ) { } private static List testList = null ; public static synchronized void register ( TestListener tl ) { } public static boolean stopThread ( String threadName ) { } public static boolean stopThreadNow ( String threadName ) { } private static boolean stopThread ( String threadName , boolean now ) { } public StandardJMeterEngine ( ) { } public StandardJMeterEngine ( String host ) { } public void configure ( HashTree testTree ) { } public void setHost ( String host ) { } protected HashTree getTestTree ( ) { } protected void compileTree ( ) { } public void runTest ( ) throws JMeterEngineException { } private void removeThreadGroups ( List elements ) { } protected void notifyTestListenersOfStart ( ) { } protected void notifyTestListenersOfEnd ( ) { } private ListedHashTree cloneTree ( ListedHashTree tree ) { } public void reset ( ) { } public synchronized void threadFinished ( JMeterThread thread ) { try { allThreads . remove ( thread ) ; <START_BUG> StandardJMeterEngine . log . info ( ( "Ending<seq2seq4repair_space>thread<seq2seq4repair_space>" + ( thread . getThreadNum ( ) ) ) ) ; <END_BUG> if ( ( ( ! ( serialized ) ) && ( ( allThreads . size ( ) ) == 0 ) ) && ( ! ( schcdule_run ) ) ) { StandardJMeterEngine . log . info ( "Stopping<seq2seq4repair_space>test" ) ; stopTest ( ) ; } } catch ( Throwable e ) { StandardJMeterEngine . log . fatalError ( "Call<seq2seq4repair_space>to<seq2seq4repair_space>threadFinished<seq2seq4repair_space>should<seq2seq4repair_space>never<seq2seq4repair_space>throw<seq2seq4repair_space>an<seq2seq4repair_space>exception<seq2seq4repair_space>-<seq2seq4repair_space>this<seq2seq4repair_space>can<seq2seq4repair_space>deadlock<seq2seq4repair_space>JMeter" , e ) ; } } public synchronized void stopTest ( ) { } public synchronized void stopTest ( boolean b ) { } private class StopTest implements Runnable { boolean now ; private StopTest ( ) { } private StopTest ( boolean b ) { } public void run ( ) { } } public void run ( ) { } private void scheduleThread ( JMeterThread thread , ThreadGroup group ) { } private boolean verifyThreadsStopped ( ) { } private void tellThreadsToStop ( ) { } public void askThreadsToStop ( ) { } private void stopAllThreads ( ) { } public void exit ( ) { } }

Fix:
StandardJMeterEngine . log . info ( ( "Ending<seq2seq4repair_space>thread<seq2seq4repair_space>" + ( thread . getThreadName ( ) ) ) ) ;